In the coordinate plane, Quadrant IV is characterized by positive x-coordinates and negative y-coordinates. Since the ordered pair given is \((x, -9)\), the y-coordinate is \(-9\), which is indeed negative and therefore places the point in Quadrant IV.
To ensure that the ordered pair is in Quadrant IV, the x-coordinate must be positive. Among the response options provided:
- 8: positive
- 0: not positive
- -7: negative
- -1: negative
The only valid choice for x that would place the ordered pair in Quadrant IV is 8.